choice of steel for tree

[_Pietro_]

I apologize for the time. .
I ask you a question waiting for some explanation. . .

I was evaluating the following question of examination (Annex) and wondering what criterion should I stick to for the choice of material for the tree.
what questions should I ask before choosing the type of steel? ? ?

I know that the shaft is subject to flexotortion in the stretch between the 2 bearings and twist where the joint is. .

other evaluations to do?? ? ?

I wait anxious... thank you. .:biggrin:
View attachment SIMULAZIONE ESAME 2009.pdf

 

[gregario]

First I would first evaluate the "work" that must fulfill your tree:

-analyze the stresses to which it is subjected (which you have already done. . )
- seen the kind of stresses you definitely need a construction steel type 39nicrmo3 or a 42crmo4, rectifying steels that to prepare for this type of stress.

That's what I'm so excited about and I suggest you

Hi.

 

[Pastorman75]

I agree with gregarius.
I do not see elements that can propel for steels with different characteristics.
Good examination!

 

[mir]

the tree must also be evaluated on the type of material in which it is in contact...

 

[Pastorman75]

I didn't see any references about it.
Did I miss something?

 

[mir]

I didn't realize it was strictly related to the exam the question... I thought it was a question that could be expected from prof.

 

[_Pietro_]

I decided to adopt a 39nicrmo3 as my advice.
http://www.ims.it/ims/ims_spa/cmscontent.nsf/documentsbyidweb/5rqmfr/$file/39nicrmo3_int.pdfI don't understand one thing though...
Can I define the breaking load of the material as it is included in the range of values assigned by the table? ?
for example can I say that rm= 1000 n/mm2 if I suppose a diameter of 30-40 mm? ? ?

and the brinell hardness?? Can I establish hb=240??
(I don't know the difference between workable, hysothermic or spheroidal ricotto)

Thanks for the interest. .

 

[SOLID]

I don't understand one thing though...
Can I define the breaking load of the material as it is included in the range of values assigned by the table? ?
for example can I say that rm= 1000 n/mm2 if I suppose a diameter of 30-40 mm? ? ?

I think it is better to use the smallest value to stay safe with regard to the sizing, while the largest value with regard to the choice of machining parameters and in particular the cutting power (kronemberg).

and the brinell hardness?? Can I establish hb=240??
(I don't know the difference between workable, hysothermic or spheroidal ricotto)

are different types of thermal treatments that serve to make the steel more workable and to relax the internal tensions.

 

[gregario]

I decided to adopt a 39nicrmo3 as my advice.
http://www.ims.it/ims/ims_spa/cmscontent.nsf/documentsbyidweb/5rqmfr/$file/39nicrmo3_int.pdfI don't understand one thing though...
Can I define the breaking load of the material as it is included in the range of values assigned by the table? ?
for example can I say that rm= 1000 n/mm2 if I suppose a diameter of 30-40 mm? ? ?

and the brinell hardness?? Can I establish hb=240??
(I don't know the difference between workable, hysothermic or spheroidal ricotto)

Thanks for the interest. .

I would advise you to choose a priori to what you want your material to work.
It is an account of the servant derived a lot from experience, but calculating the maximum diameter of the tree with this "work puzzle" you get an idea of what the minimum diameter can be considered in a given section.
after that check considering the minimum value of the sigma (as you have already been highlighted) for that specific diameter of bar and see a little if you have made the right choice.

never consider the recoupled material because it is "burro", it has no mechanical characteristics, consider in the verifications the material as reclaimed that instead depending on the type of material so it has all the mechanical characteristics necessary to the case.

Hi.

 

[Tano5oo]

I train here not to open another topic.. .
someone has a link with the mechanical characteristics of the most used steel materials for mechanical construction...type trees? ? ?
c40-c50-crm....etc? ?

 

[meccanicamg]

I train here not to open another topic.. .
someone has a link with the mechanical characteristics of the most used steel materials for mechanical construction...type trees? ? ?
c40-c50-crm....etc? ?

Then I'll give you some information:
- the material cards found on the internet on the sites of steel manufacturers such as ims
- for the choice of materials to be used as trees it tends to exclude almost always structural steels as s275jr uni en 10025 which is basically a construction steel for carpenters, sheet metals etc.) and goes to the classic c40 or c45e uni in 10083 by reclaiming for unsolicited trees with the possibility of making an even superficial tempering induction. for medium-stressed trees when the c45e is not enough you go to 42crmo4 uni in 10083 from reclamation and then switch to 17nicrmo6-4 uni in 10084 from more hardened cementing that allows very high resistances even under alternating loads of fatigue.
- other types of steels can be used such as automatic or self-templating steels or sulphurous steels to increase machinability but are finesses that come last
- all the steels that I have mensed come very high as breaking and yielding load if properly hardened and you can see how they reach the same hrc values (hrc/rm table comparison) even if not in all cases it is possible to get to heart with those characteristics
- the values to be adopted as rp0,2 and rm are the minimum ones in the first approximation to make the sizing while for the verification they adopt those of the range of the diameters considered. Moreover, no ricotti is used unless for pre-work, then reclaims by increasing the mechanical characteristics. at least 55 hrc we arrive all those steels above indicated after heat treatment

 

[rotellagabri]

I should also choose 3 steels for the construction of a tree from the rough piece... would you know how to give me advice? I have to choose 3 and then my prof will decide 1solo. I had decided some ..maybe you make a selection. .
♪
fe510
♪
39nicrmo3
♪

 

[MassiVonWeizen]

as written by mechanicsmg the fe430 and fe510 sonp to exclude (they are the old name of the s275 and s355, qui a table of conversion of standards. preserve it that always comes useful especially if you have to deal with drawings or texts dated)
then what's that for? as mentioned in previous posts the material is chosen according to the function of the element to be built

 

[meccanicamg]

I should also choose 3 steels for the construction of a tree from the rough piece... would you know how to give me advice? I have to choose 3 and then my prof will decide 1solo. I had decided some ..maybe you make a selection. .
♪
fe510
♪
39nicrmo3
♪

Do we choose randomly? I don't know.

c40 or c45 you do practically everything (you can say that at commercial level you find more easily c45), 39nicrmo3 saves your life if you have to make very stressed trees. s275 and similar will suit you if you have to weld tree parts with other components

 

[adelchi]

I was evaluating the following examination question (Annex) and

if you are looking for the internet you can also find the solution.
I think the steel that proposes the solutor is more than good.

Why are you looking for another? ?

 

[rotellagabri]

Do we choose randomly? I don't know.

c40 or c45 you do practically everything (you can say that at commercial level you find more easily c45), 39nicrmo3 saves your life if you have to make very stressed trees. s275 and similar will suit you if you have to weld tree parts with other components

I'd need 3 steels for this big tree. has length 57 cm and maximum diameter 21 cm as I have to multiply the odds for 3.35 ..I should find the placement then.c40 and c45 I can not choose them because already used by others

 

[MassiVonWeizen]

I would start thinking in millimeters if you have to work with mechanics. for the centimeters it is good cazzuola and level.
Then such a tree is not great at all, I assure you.
and why can't you use the material chosen by others? admitting that a c45 is suitable, both at the level of use and costs, means that that is the material to choose. finished also steels from reclamation and company what you can choose. . the adamantio(cit.)?
you will have a guideline to make a weighted decision I hope.
otherwise shoot 3 randomly by putting one by category and you probably get rid of it.

remains that first decide what you have to do with this tree then choose the material.

 

[rotellagabri]

Then I leave with saying k is my first project k I have to do.. and it serves for the university.. and I am inexperienced.seno I did not ask you. he told me the prof to choose these 3 steels then he decides one of the three that the mandos.the tree is as already said 570 mm for 210mm..c40 c45 and 39nicrmo3 have been chosen by other groups therefore I can not choose them. I have to find others that are always suitable for this use..

 

[paulpaul]

the material is chosen according to structural, functional, productive needs, etc.: how do we advise you if we do not know them? (the indications have already given you mechanicalmg).

 

[MassiVonWeizen]

the dimensions of the tree do not affect the type of material, its function is.
that of the material that you cannot choose does not understand, but I am not professor therefore.. .
I can suggest you propose some steel and maybe motivate it and then we tell you whether it's okay or not.